The weakCompareAndSetVolatile() method of a AtomicReferenceArray class is used to atomically sets the value of the element at index i to newValue to newValue for AtomicReferenceArray if the current value is equal to expectedValue passed as parameter. This method updates the value with memory effects as specified by VarHandle.weakCompareAndSet(java.lang.Object…).This method returns true if set a new value to AtomicReference is successful. Syntax:
public final boolean weakCompareAndSetVolatile(int i, E expectedValue, E newValue)
Parameters: This method accepts i which is an index of AtomicReferenceArray to perform the operation, expectedValue which is the expected value and newValue which is the new value to set. Return value: This method returns true if successful. Below programs illustrate the weakCompareAndSetVolatile() method: Program 1:
// Java program to demonstrate AtomicReferenceArray // weakCompareAndSetVolatile() method import java.util.concurrent.atomic.AtomicReferenceArray;
public class GFG {
public static void main(String[] args)
{
// create an atomic reference object.
AtomicReferenceArray<Double> ref
= new AtomicReferenceArray<Double>( 5 );
// set some value
ref.set( 1 , 1234.00 );
ref.set( 0 , 2234.00 );
ref.set( 2 , 3234.00 );
// apply weakCompareAndSetVolatile()
boolean result
= ref.weakCompareAndSetVolatile( 1 , 124.00 ,
234.32 );
// print value
System.out.println("Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 1 = "
+ ref.get( 1 ));
}
} |
Program 2:
// Java program to demonstrate AtomicReferenceArray // weakCompareAndSetVolatile() method import java.util.concurrent.atomic.AtomicReferenceArray;
public class GFG {
public static void main(String[] args)
{
// create an atomic reference object.
AtomicReferenceArray<String> ref
= new AtomicReferenceArray<String>( 5 );
// set some value
ref.set( 0 , "AMANDIP");
ref.set( 1 , "AMAN");
// apply weakCompareAndSetVolatile()
boolean result
= ref.weakCompareAndSetVolatile(
0 ,
"AMARDIP",
"AMAR");
// print value
System.out.println("Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 0 = "
+ ref.get( 0 ));
}
} |